Nuclear Chemistry

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Across
  1. 2. protons plus neutrons
  2. 4. atoms with the same number of protons but different numbers of neutrons
  3. 6. a neutron turns into a proton and an electron
  4. 7. very high energy light
  5. 8. when the nucleus of an atom splits into two or more smaller nuclei
  6. 10. a reaction that changes the nucleus of an atom
  7. 12. Nuclear fission releases neutrons as products, which can trigger more fission reactions
  8. 13. either an electron or a positron
  9. 14. the number of protons in an atom
  10. 16. amount of time it takes for half the radioactive material to decay
  11. 17. particle with the same mass as an electron but positively charged
  12. 20. release of gamma radiation
  13. 21. release of an beta particle and energy
Down
  1. 1. when two or more nuclei combine to form a larger nucleus
  2. 3. a helium nucleus, made of 2 protons and 2 neutrons
  3. 5. holds subatomic particles such as protons and neutrons together
  4. 9. used to absorb extra neutrons so that the fission reaction can be controlled
  5. 11. the time it takes for half of the original amount of a substance to undergo a change
  6. 15. a proton turns into a neutron and positron
  7. 18. the release of energy from an unstable nucleus
  8. 19. release of an alpha particle and energy